One of the most interesting topics I came across at the executive masters in project management was related to human (psychological) factors, more specifically Cognitive Bias. A Cognitive Bias is "a pattern of deviation in judgment, whereby inferences about other people and situations may be drawn in an illogical fashion". There are lots and lots of Cognitive Bias, but here goes one of my favorites:
Negativity Bias is a kind of Cognitive Bias where one tends to notice and remember negative events and information rather than positive. For instance, It's a beautiful sunny day, you have your perfect clothes for that important meeting. On your way to the office, just before entering the building, a pigeon comes along and "does it" on you. "Damn! Bad luck! How is this possible? Argh". If the meeting doesn't go just perfect, you will remember "that damn pigeon". And you'll focus on that. You'll talk about it with your friends. But, how about all the other 3472840 days that no pigeon ruined anything? Why focus on the one time it hit you?
Here's a small article on Negativity Bias: How Negativity Creates Fear